18366381918211 has 4 divisors (see below), whose sum is σ = 18366691087512. Its totient is φ = 18366072748912.

The previous prime is 18366381918179. The next prime is 18366381918217. The reversal of 18366381918211 is 11281918366381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18366381918211 - 2⁵ = 18366381918179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18366381918217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154495525 + ... + 154614358.

It is an arithmetic number, because the mean of its divisors is an integer number (4591672771878).

Almost surely, 2^{18366381918211} is an apocalyptic number.

18366381918211 is a deficient number, since it is larger than the sum of its proper divisors (309169301).

18366381918211 is an equidigital number, since it uses as much as digits as its factorization.

18366381918211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309169300.

The product of its digits is 2985984, while the sum is 58.

The spelling of 18366381918211 in words is "eighteen trillion, three hundred sixty-six billion, three hundred eighty-one million, nine hundred eighteen thousand, two hundred eleven".